US2678070A

US2678070A - Automatic curve cutting sawing apparatus

Info

Publication number: US2678070A
Application number: US301293A
Authority: US
Inventors: Sr Walter M Davis
Original assignee: Individual
Current assignee: Individual
Priority date: 1952-07-28
Filing date: 1952-07-28
Publication date: 1954-05-11
Anticipated expiration: 1971-05-11

Description

May 11, 1954 w. M. DAvls, sR

AUTOMATIC CURVE CUTTING sAwTNG APPARATUS Filed July 28, 1952 8" Sheets-Sheet l cw mm m W m D M. A m A m n r @u M m w www k.

mm n@ am um .nh WN... I. 5% 8. l l R m5 May ll, 1954 w. M. DAvls, sR 2,678,070

AUTOMATIC CURVE CUTTING SAWING APPARATUS Filed July 28, 1952 8 Sheets-Sheet 2 11. 1954 w. M. DAvls, SR AUTOMATIC CURVE CUTTING sAwING APPARATUS Filed July 28, 1952 8 Sheets-Sheet 3 Wn rm M. Dir/s, 5A'.

INVENTOR -*VN L) BY p ATT DRNEY5.

May ll, 1954 w. M. DAvls, sR

AUTOMATIC CURVE CUTTING SAWING APPARATUS Filed July 2s, 1952 8 Sheets-$heet 4 Mum MDN/s, SA.

INVENTOR.

ATTORNEYS.

May l1, 1954 w. M. DAvls, SR

AUTOMATIC CURVE CUTTING sAwTNG APPARATUS Filed July 28, 1952 8 Sheets-Sheet 5 INVENTOR: Wurm M Day/5,5m

ma e M ATTORNEYS May 11, 1954 w. M. DAvls, sR

AUTOMATIC CURVE CUTTING sAwTNC APPARATUS Filed July 28, 1952 8 Sheets-Sheet 6 W/urf/e M. DAV/s, 5p..

INVENTOR MAM.

ATTORNEYS May ll, 1954 w. M. DAVIS, SR

AUTOMATIC CURVE CUTTING SAWING APPARATUS med July 2s, 1952 8 Sheets-Sheet 7 INVENTOR: Mum? M Daf/5, 5;?.

ATTORNEYS.

May 11 1954 w. M. DAVIS, sR 2,678,070

AUTOMATIC CURVE CUTTING SAWING APPARATUS Filed July 28, 1952 8 Sheets-Sheet 8 1N VENT OR 2 Wurm M DAV/s, 5k.

JIJ-'12 BY @4MM ATTORNEYS.

Patented May 11, 1954 UNITED STATES FATENT CFFICE AUTOMATIC CURVE CUTTING SAWING APPARATUS This invention relates to woodworking and woodcutting machinery and more especially to an apparatus adapted for use with a bandsaw machine, scroll cutting machine or the like for successively automatically cutting irregularly shaped pieces or articles from a workpiece and automatically varying the position of the workpiece relative to the cutting blade according to a predetermined pattern.

Heretofore, in order to cut a plurality of identical pieces or articles from a common workpiece on a bandsaw machine or the like, many manual operations have been required. In some instances, it has been necessary to mark out the shape of each individual piece or article to be cut from a workpiece and to use this outline as a guide in cutting each piece from the workpiece. In other instances, `a movable base or platform has been provided on which a workpiece was adjustably secured and which platform, with the workpiece thereon, would be moved manually past the cutter blade with pattern means being provided to assist the operator in guiding the pattern and the workpiece past the cutter blade. Upon each individual article or piece being cut from the workpiece, it was also necessary for the operator to adjust the workpiece relative to the base or platform for each successive cutting operation.

It is the primary object of this invention to overcome such defects as above mentioned by providing a platform adapted to rest upon the usual bandsaw machine table and on which a workpiece in the form of a block of wood or other material may be positioned and wherein means are provided for automatically reciprocating the platform and the workpiece simultaneously past the cutting blade while simultaneously and automatically moving the workpiece and the platform in unison relative to the cutting blade or saw according to a predetermined pattern and, further, upon cach successive piece or article being cut from the workpiece, automatic advancing or feeding means moves the workpiece toward the saw or cutting blade relative to the platform a predetermined distance according to the desired thickness of each successive piece to be cut from the workpiece, whereby a plurality of individual pieces or articles of predetermined configuration may be automatically cut or severed from a common workpiece in succession obviating the necessity of performing any manual operations other than placing the workpiece upon the said platform and securing the workpiece to the feeding means. l

More specifically, it is an object of this invention to provide apparatus for use in conjunction with a conventional bandsaw machine including a planar platform or workpiece support having one of its edges cut away in substantially the shape of the pieces to be cut from the workpiece and upon which the workpiece is positioned. An elongated pattern element is mounted beneath the table and is provided with a groove therein shaped according to a predetermined pattern, and the bottom of the platform, resting upon the table of the machine, also has an elongated substantially straight groove in the lower surface thereof, there being a connection between the groove in the pattern element and the groove in the bottom of the platform. Means are provided for automatically reciprocating the platform and the pattern element relative to each other and relative to the bandsaw blade whereby, upon movement of the workpiece on the platform towards the cutting edge of the bandsaw, the grooved pattern element causes the platform to move in a circuitous or irregular path according to the curvature or shape of the pattern groove in the pattern element. At the end of each stroke of the platform, means are provided to automatically move the workpiece on the plat form away from the cutting blade whereupon means automatically cause the platform to reverse its direction of movement to return the same to its original position.

Each time the platform returns to its original position, automatically operable means cause the workpiece to be advanced relative to the platform according to the thickness of each successive article or piece to be cut from the workpiece and whereupon another active stroke of the platform with the workpiece thereon is effected.

Some oi the objects of the invention having been stated, other objects will appear as the description proceeds, when taken in connection with the accompanying drawings, in which- Figure 1 is a side elevation of the improved apparatus showing the same in association with a bandsaw machine, the upper portion of which is broken away;

Figure 2 is a front elevation of the improved apparatus looking at the left-hand side of Figure 1 but omitting the upper portion of the bandsaw machine;

Figure 3 is a top plan view of the improved apparatus showing the same in association with the table and cutting blade of a bandsaw machine;

Figure 4 is a view similar to Figure 3, but show- 3 ing the workpiece, the movable platform and the interconnected parts in a different position than that in which they are shown in Figure 3;

Figure 5 is an enlarged fragmentary vertical sectional view taken substantially along the line 5 5 in Figure 2, showing particularly the means for imparting movement to the movable platform and the pattern element;

Figure 6 is an enlarged detail looking substantially along the line -S in Figure 3, with parts in section, showing the means for advancing the workpiece transversely of the cutting edge of the bandsaw cutting blade in a step--by-step manm ner preparatory to cutting or severing each successive article or piece from the workpiece;

Figure 7 is an inverted plan view of the v'workpiece support or platform disassociated from the rest of the machine, but showing the relative position of the cutting blade and looking up substantially along the line 1 -1 in Figure 2;

Figure 8 is a top plan view of the pattern form or cam plate with parts in section, taken substantially along the line 8 8 in Figure 2;

Figure 9 is an enlarged fragmentary isometric View with parts in section and par-ts broken away showing some of the intervening connections for effecting reciprocatory movement of the` pattern element or cam plate and the workpiece support or platform;

Figure l is an enlarged fragmentary vertical sectional view taken substantially along the line I--I in Figure 6; v

Figure l1 is a fragmentary vertical sectional View taken substantially along the line -I l-I-I in Figure 10, showing the overriding clutch mechanism associated with the means for advancing the workpiece relative to the workpiece support or platform;

Figure l2 is a schematic illustration of the hydraulic and electrical connections vfor effecting operation of the various movable elements of the machine in proper sequence.

Referring more specificallyY to the drawings, the numeral lil broadly designates ahollow frame il) of a bandsaw machine or the like and which includes a lower wheel housing-I I adapted to -rest upon a floor F and which supports a conventional bandsaw-table or platform i2. VAri-extension i rises upwardly from the rear of the housing II and has an arm Iii suitably secured thereto which rotatably supports an upper -wheel or pulley I5. A lower wheel or pulley it is supported for rotation inthe lower housing I i.

The pulleys I5 and i6 support a bandsaw or endless cutter @blade I1 which extends through a suitable guide mechanism broadly designated at 2t and supported by the free end of the arm I. The bandsaw or endless cutter blade i1 also extendsthrough a suitable slot or opening 2l (Figure 5) in the table -or platform i2 and throughY suitablerguide means 22 disposed beneath the opening 2l in the table I2. The lower wheel I@ is driven by means of a sprocket wheel 23 which is engaged by a sprocket chain 2li. The sprocket chain 24 is also mounted on a sprocket wheel 25 xed on a motor shaft 26 extending from anelectric motor shaft 26 extending from an electric motor 21 (Figure 2).

The electric motorr21 has suitable wires Slland 3l extending therefrom to a suitable source of electrical energy, not shown. The bandsaw machine is'of conventional constructionrand a further description thereof is therefore deemed unfnecessary. i Y

It is with a machine ofthe character described conventional bandsaw machine table I2 and is supported -at thesame level as the conventional bandsaw machine table I2 by means to be presently described. The plate or auxiliary table top 35 is suitably secured to the upper surfaces of front and intermediate transverse frame members 31 and 38, shown in the form of channel bars in Figure 5, which are connected at opposite ends thereof to frame members 4I and 42.

The frame members 4-I and 42 extend rearwardly from the framemember 31 and the rear portion of each of the frame members 4I and 42 is cut away Aas 'at 43 (Figure l). The rear ends of the frame members 4I and 42 are connected to the outer ends of respective transverse frame members 44 and 45 (Figures l and 3), The proximal endsof the transverse frame members `i4 vand 45 terminate closely adjacent opposite sides of the conventional table top I2, The framework formed from the channel bars or frame members 31, 38 and 4I to 45, inclusive, is supported on a pair of front legs 46 and 41 and a pair of rear legs 50' and `5I.

The rear -legs 50 and 5I are preferably for-med as shown in Figure 1 so the lower ends thereof are disposed forwardly of the vertical plane of the rear edge of the table top 36 so the auxiliary table 35 does not take up -any more fioor space than is necessary.

It will be noted in Figure 3 that the opening 2| through which the cutter blade or `bandsaw I1 extends is in the form of a slot which extends to one edge 'of `the conventional table `top AI2 and which is kprovided -to facilitate mounting the cutting -blade -or bandsaw I1 on the .wheels or pulleys I5 and I3. Therefore, the auxiliary table top 35 is=cut away, as at 52, so the cutting blade I1 may be moved forwardly or rearwardly'between theauxil-iary table top-36 andthe conventional `table -top I2 .for installation purposes.

Now, la workpiece support, vbroadly designated at 55, in the form of a platform or plate, rests upon theauxiliary tabletop 36 and a workpiece W rests upon the platform 55. This workpiece may be in the form` of a solid block as shown in Figure `5 or may be laminated as shown in Figures 1 and 2 and may be of any desired workable material such as lumber, Vsheet metal, cardboard, leather, composition material and the like. The rear edge of 'the platform or workpiece support 55 is provided with an irregular surface 55 which isshown as being serpentine in this instance and, in order 'to automatically advance the workpiece W beyond this irregular surface 56 following each cutting operation, the workpiece Wis secured to a vertically disposed .plate 51, as by screws 60 (Figure 3). The plate 51 isa part of a workpiece feeding apparatus broadly designated at El, which also includes a plunger in the'form of a rack 62, to the rear end of which the plate 51 is suitably secured. The rack 62 is mounted for longitudinal sliding movement in an elongated tubular guide member S3 (Figure 10) suitably secured, as by welding, to the upper surface of a dovetailed slide or guide plate 64.

The dovetailed slide or guide plate 64 is mounted for longitudinal sliding movement on a feed mechanism base plate 55 and between guide ways or gibs 66 and 61 as best illustrated in Figure 10. It will be observed in Figure 3 that the feed mechanism base plate 55 is substantially larger than the dovetailed slide or guide plate 5f! and is suitably secured to the upper surface of the workpiece support platform 55.

ln order to effect reciprocatory movement to the dovetailed slide 64 and the tubular guide member 63, a horizontally disposed ram is provided which comprises a hydraulic or pneumatic cylinder 10, opposite ends of which are closed by a cylinder head 1| and a cylinder base 12 (Figure 6). The cylinder head 1| is suitably secured, as by welding, to the feed mechanism base plate 55. Flexible pipes or conduits 13- and 'ill are connected to the cylinder head 1| and cylinder base 12 respectively for communication with the interior of the cylinder 10. Mounted for longitudinal sliding movement in the cylinder head 1| and the cylinder base is a piston rod 15, the medial portion of which has a piston 15 fixed thereon mounted for longitudinal sliding movement in the cylinder 10.

In order to adjust the length of stroke of the piston rod 15 in opposite directions, opposite ends of the piston rod 15 have

washers

11 and 10 mounted thereon (Figure 6), the outer surfaces of which bear against respective adjustment nuts 00 and 8| threadablymounted on opposite ends of the piston rod 15. Thus, upon an active stroke of the piston rod 15, the washer 18 engages the outer or front end of the cylinder base 12 and, upon an inactive or forward stroke of the piston rod 15, the washer 11 engages the cylinder head 1|.

The rear end of the piston rod 15; that is, the end of the piston rod 15 nearest the endless cutter blade or bandsaw l1, is connected to a plate or bar 82 by means of a screw 83. It will be observed in Figure 3 that this bar 82 extends to the left from the screw 83, beneath the rack 52 and is suitably secured to the upper surface of the dovetailed slide or guide plate 54, as by we1d ing (see also Figure 6).

Spaced rearwardly from the cylinder 10, and being suitably secured to the upper surface of the guideway or gib 61, as shown in Figure 10, is a post 85, in the bifurcated upper end of which a latch means in the form of a relatively short rack 86 is mounted. In this instance, the rack 85 is mounted for pivotal movement on a fixed pivot pin 31 (Figure 6) carried by the post 85 and a removable locking pin 90 also slidably penetrates the post 85 and the rack 8S to maintain the rack 86 in a fixed horizontal position. The purpose of the removable pin 90 is to permit the rack 86 to be pivoted about the pin 81 when an operator desires to move the plunger 62 forwardly or rearwardly independently of the cylinder 10 or the piston rod 15 as would be necessary in replacing the workpiece W on the workpiece support or platform 55.

The rack or plunger 52 engages the lower portion of a pinion 03 (Figure 10) and the rack 36 engages the upper portion of a pinion 94. The pinion 93 is keyed or otherwise secured to a transverse shaft 95 rotatably mounted in bearing blocks 96 and 91. The upper portion of the tubular guide member 53 is provided with an arcuate transverse groove |00 therein in which the bearing blocks and 91 are disposed, these bearing blocks being suitably secured to the tubular guide member 53, as by welding. The tubular guide member 53 also has a relatively short longitudin nally extending slot ||l| therein through which the gear or pinion 93 extends for engagement with the rack 62.

The pinion 94 forms a part of a racking mechanism shown in the form of an overriding clutch mechanism broadly designated at |02 (Figure 11) and which includes a housing |03 having a reduced portion |04 (Figure 10) integral therewith to which the pinion 94 is suitably keyed or other- Wise secured. The reduced portion |04 of the circular housing |03 is slidably mounted on the shaft 05 in order to permit relative rotational movement between the housing |03 and the shaft 95. Bisposed within the housing |03 is a clutch element or rotor |05 which is keyed or otherwise fixed on the shaft 95 and which is provided with a plurality of notche |01 in the periphery thereof.

Each of the notches |01 is substantially triangularly shaped and has a pair of relatively small balls i0 mounted therein, which balls are normally urged outwardly by compression springs disposed in suitable bores ||2 in the rotor |05. Thus, upon rotation of the housing |53 in a counter-clockwise direction in Figure l1, relative to the rotor |05, the balls will move towards the small ends of the grooves or notches |01, as defined by the junctures of inner periphery of the housing |03 and the bottoms of the notches |01, and will thereby cause like rotation. to be imparted to the rotor |05, the shaft 95 and the gear 93.`

On the other hand, upon relative movement between the rotor |05 and the housing |03 in the opposite direction; that is, upon rotation of the rotor |05 in a counter-clockwise direction relative to the housing |03, the housing |03 may remain stationary since the balls ||0 will tend to move towards the large ends of the notches |01. It is thus seen that, upon each active or rearward stroke of the piston rod 15, the tubular guide member 53, shaft 95, pinions 93 and 94 and the overriding clutch mechanism |02 will also move rearwardly therewith. Since the track 8B remains stationary, the pinion 94 is caused to rotate in engagement with the rack 35 in a counter-clockwise direction in Figure G.

It is obvious that this will cause the housing |03 of the overriding clutch mechanism |02 to also rotate in a counter-clockwise direction in Figure l1 which will, in turn, cause the shaft 95 and the pinion 93 to rotate in the same direc:l tion thereby causing the plunger or rack 52 to move rearwardly relative to the tubular guide member to feed the workpiece toward the endless cutter blade or bandsaw |1 a predetermined distance. Of course, during a return stroke of the piston rod 15 and the associated parts, including the shaft 95, the pinion 94 will be caused to rotate in a clockwise direction in Figure 6 and the pinion S3 and shaft 95 are thereby permitted to rotate therewith in the opposite direction so the plunger or rack 62 may remain stationary, due to the relative movement between the rotor |05 and the housing |03 of the overriding clutch mechanism |02.

Now, assuming that the thickness of each article A (Figures 3, 4 and 5) to be cut from the workpiece W is to be three-fourths of an inch thick, the diameters of the gears 03 and 94 are such that the rack 62 moves twice as far with 7 each active stroke ofthe piston rod 1 5 as the piston rod 15, the dove-tailed plate 64 and the tubular guide member 63. In other words, the piston rod 15, the dove-tailed plate 64 and the tubular guide member 63 move three-quarters of an inch relative to the cylinder 'IIJ and the workpiece support 55, while the rack 52 moves twice as far or one and one-half inches relative to the workpiece support 55 to thereby advance the workpiece a total of one and one-half inches upon the termination of each inactive stroke of the workpiece support 55.

n the other hand, upon the termination of each active stroke of the workpiece support 55, in cutting an article A from the workpiece W, the piston rod 'I5 moves forwardly and the length of the return stroke of the piston rod 15 is identical to the length of the active stroke thereof or three-quarters of an inch, in this instance. Thus, upon each inactive or return stroke of the piston rod 15, the dove-tailed plate 64 and the tubular guide member 63 will also return an equal distance therewith or three-fourths of an inch.

Now, referring to Figures 6 and l0, it will be observed that a friction element II3 is mounted for radial adjustment in one side of the tubular guide member 53. This friction element IIS, which is preferably made from a semi-hard rubber or a fibrous material such as leather, felt and the like, is held in frictional engagement with one side of the plunger or rack 52 by an adjustment screw |I3a. Hence, with each inactive stroke of the piston rod 15, the rack or plunger G2 is caused to move forwardly, away from the bandsaw blade I1, with the tubular guide member 63. Of course, upon each active stroke of the piston rod 15, it is evident that the

gears

93 and 94 will overcome the frictional resistance of the friction element II3 and will thereby advance the rack or plunger 52 relative to the tubular guide member 63.

It is thus seen that, upon each article A being severed from the workpiece W, the workpiece is moved forwardly away from the endless cutter blade a predetermined distance so that it does not engage or rub against the cutter blade l1 during the inactive stroke of the workpiece support 55. Then, the workpiece is advanced twice the distance that it was previously withdrawn from the cutter blade I1 preparatory to a succeeding article A being severed from the workpiece W of exactly the same thickness as the article A previously severed from the workpiece W, in the course of each successive active stroke of the workpiece support 55.

A means for controlling the fiow of fluid under pressure to oppositeends of the cylinder 'i5 in proper timed relation to movement of the workpiece support or platform 55 will be later described.

In order to prevent sidewise movement of the workpiece W under pressure of the cutter blade i1 during a cutting operation, a forwardly and rearwardly extending guide element or bar IIt (Figures 2V and 3) is suitably secured to the upper surface of the workpiece support or platform 55 against which the corresponding edge of the workpiece W has sliding movement as it is intermittently fed towards the irregular edge 55 of the workpiece support or platform 55- by the workpiece feeding mechanism 5I. l

Pattern mechanism Referring particularly to Figure 7, it will be observed that the lower surface of the workpiece support 55v has a pair of spaced substantially parallel irregular grooves |20 and I2I therein, the first groove |20 preferably being narrower than the second groove I2| and both of these grooves being formed substantially parallel to the configuration of the irregular surface 55 of the workpiece support 55. Of course, these grooves I 20 and I2I must extend in exact parallel relation to the shape of the articles A to be cut from the workpiece W.

The lower surface of the workpiece support 55 also has an elongated groove |22 in the lower surface thereof which preferably extends from one end of the workpiece support 55 to the other in substantially parallel relation to the optimum direction of movement of the workpiece support 55 as it moves past the cutter blade I1. This groove |22 preferably extends at a slight angle relative to the optimum direction of movement of the workpiece support 55 past the cutting blade I1 in order that a minimum amount of space is'required for the pattern form or cam plate to be presently descrlbed.

A fixed guide roller or follower |23 (Figures 3 and 4) is disposed immediately forwardly of the cutting edge of the cutter blade or bandsaw I1 and the walls of the groove |25 are adapted to engage this fixed guide roller |23. The guide roller |23 is carried by and projects upwardly from the conventional table top I2. One of the walls of the groove I2I has a plurality of projections thereon which, in this instance, are formed by a link chain |24 suitably secured against the rear wall of the groove I2. The link chain |24 is engaged by a sprocket wheel |25 disposed within the groove I2I, which sprocket wheel is fixed on a vertically disposed shaft |25 (Figure 5). Y

It will be observed in Figure 5 that the conventional table top I2 is provided with an opening |35 through which the shaft |25 loosely extends into a tubular extension I3I (Figures 5 9). Projections or pins |32 extending outwardly from the shaft I 26 and fit in corresponding slots |33 in the upper end of the tubular extension I 3| to thereby facilitate lifting the sprocket wheel E25 and the shaft |26 out of engagement with the tubular extension I3I. The tubular extension |3I is fixed, as by welding, to a vertically disposed shaft |34, the medial portion of which is rotatably mounted in a gear housing |35 suitably secured to the upper surface of a forwardly and rearwardly extending support plate |35,

It will also be observed in Figure 5 that the lower end of the shaft |32 is rotatably mounted in the horizontally disposed support plate |35 and is prevented from moving vertically by a pinion |31 fixed on the shaft |34 within the gear housing |35. The lower end of the pinion |31 has sliding rotational movement against the upper surface of the plate |35 and the upper end of the pinion |31 has sliding rotational movement against the upper wall of the housing |35.

The support plate |36 depends from the con.- ventional table top I2 and is spaced therebeneath by hanger members or frame members I di) to |52, inclusive, suitably secured at their lower ends to the VSupport plate |36 and being suitably secured at their upper ends to the lower surface of the conventional table top l2. spaced between the lower surface of the conventional table top I2 and the upper surface of the support plate E36 is a pattern form guide element shown in the form of a channel bar M5 (shown in dashand-dot lines in Figure 9) which is relatively short and supported at one edge thereof by the hanger element or support |42 and being suitably supported at the other edge thereof by the hanger elements or frame members |46 and |4|,

An elongated flat'pattern form or cam plate |46 is mounted for longitudinal sliding movement in the guide element or channel bar |45 and is retained thereon by angle clips |41 carried by the flanges of the channel bar |45 and by a shoulder |56 formed on the support |52. The pattern form or cam plate |46 is substantially rectangular in plan and in cross section and the upper surface thereof is provided with a cam groove or pattern groove of irregular configuration which extends generally longitudinally of the pattern form or cam plate M6. This cam groove or pattern groove |5| is shaped to conform to the varying angles that the workpiece support or platform '55 must be positioned in order that the constantly moving and varying points of tangency of the irregular edge 56 of the workpiece support or platform 55 move parallel to the cutting edge of the cutter blade I1.

Driving means for pattern mechanism Now, in order to effect lmovement of the workpiece support 55 in one direction while moving the pattern form or cam plate |56 in the opposite direction a relatively long pneumatic or hydraulic cylinder |52 is adjustably secured to the lower surface of the support plate |36 by means of a split bracket |53 welded to the lower surface of the support plate |36 and which is clamped about the left-hand portion of the cylinder |52 in Figure 2 by suitable bolts |54. Opposite ends of the cylinder |52 are closed by cylinder head |55 and a cylinder base |56. A piston |51 is mounted for longitudinal sliding movement in the cylinder |52 and a piston rod, connected to the piston |51, slidably penetrates the cylinder head |55 and the outer end or left-hand end thereof in Figure 2 is suitably secured to a block |6| (Figures 2 and 12).

The block is fixed to a bracket |52 which extends upwardly in Figure 2 and suitably secured to the lower surface of the pattern form or cam plate |46. Also, suitably secured to the block |6| is one end of a rack |65 (Figure 9) which extends in parallel relation above the cylinder |52. The rack |65 is supported for longitudinal sliding movement upon the support plate |35 and is held in engagement with a gear |66 by a guide bar |61 (Figures 5 and 9) suitably secured, as by welding, to the hangers or frame members |46 and'llll.

The cylinder base |56 has one end of a conduit or pipe |12 connected thereto and one end of a pipe or conduit |13 is connected to the cylinder |52 adjacent the cylinder head |55 (Figure 12). A means is provided, to be presently described, for alternately directing fluid under pressure through the pipes 0r conduits |12 and |13. It is thus seen that, upon fluid under pressure being alternately directed to opposite ends of the cylinder |52, the rack |65 and the pattern form or cam plate |46 reciprocate in unison. It is evident that reciprocaton of the rack |65 causes oscillation of the sprocket wheel through the intervening gears |66, |16 and |31 and, since the sprocket wheel |25 meshes with the sprocket chain |24 in the groove |2| workpiece support 55, this causes the workpiece support to reciprocate and, in so doing, to move in a direction opposite from the direction of `movement of the pattern form or cam plate |45.

Now, in order to cause the workpiece support 55 and the workpiece W to move along an irregular path of predetermined configuration upon each reciprocation thereof, a lever arm |15, which may also be termed a stylus, is oscillatably mounted, as at |16, on the lower surface of the conventional table I2, immediately above the pattern form or cam plate |46, as is most clearly shown in Figure 5. One end of the lever arm `|15 has a downwardly extending stub shaft |11 fixed thereto and the other end thereof has an upwardly extending stub shaft |26 fixed thereto (Figures 5 and 2, respectively).

It is evident that this will cause the follower |82 to also swing about the pivot point |16 of the lever arm `|15 to thereby swing the workpiece support or platform '55 in opposite directions about the follower wheel |23 (Figure '1) so the cutting blade l1 will cut an article A from the workpiece W shaped to conform to the groove |5| in the pattern form |46 and conforming to the shape of the surface 56 on the workpiece support 55.

conduits

13 and 12| remote from the cylinder 16 are connected to the respective pipes |12 and |13. interposed in the pipes |12 and |13 at points between the cylinder |52 and the pipes or

conduits

13 and 1| are reducing valves |61 and |68.

Alined with the pipes |12 and |13 and penetrating the opposite side of the housing from that penetrated by the pipes |12 and |13 are branch pipes |5| and |62, respectively, which are connected to a common pipe or conduit |93. The end of the pipe or conduit |53 remote from the branch pipes lill and |92 penetrates a housing |95 of a manually operable regulator valve |55. This regulator valve |55 may be of any desired or conventional construction and is preferably of the type manufactured by Vickers, Detroit, Michigan, under their Model No. S-206-AC and under United States Patent Number 2,102,865.

The regulator valve |55 has a manually movable core |96 therein which is provided with a passageway or chamber |91 for establishing cornmunication between the pipe |53 and a pipe 200 which also penetrates the housing |913. The end of the pipe 205 remote from the regulator valve |55 is connected to a hydraulic pump 20| having a pipe 252 extending therefrom into a suitable reservoir 203. An electric motor 204 is supported by the reservoir 253 and has

Wires

205 and 205 extending therefrom, to a suitable source of electrical renergy not shown.

The motor 254 is coupled to the hydraulic pump to cause fluid under pressure to flow from the reservoir 255 through the pipe 26|) to the regulator valve |55. Since the electric motor 2513 drives the pump 25| continuously, a pipe 2|i is connected at one end thereof to the pipe 25|) and has a pressure relief valve 2li interposed therein. The other end of the pipe 2HE extends into the reservoir 253. Thus, when the manually operable regulator valve |95 is closed, as shown in Figure i2, the pressure relief valve 2li permits the duid from the pipe 255 to return tothe reservoir 253 through the pipe 2H). V. A return pipe or conduit 2 |2 is also connected to and penetrates the housing |35 of the solenoid valve |55 at one end thereof, the other end thereof being connected intermediate the ends of pipe 2|i. The solenoid valve |85 may be of any desired construction and is shown schematically in Figure l2 merely to illustrate the cycle of operation of the machine.

The housing |35 of the solenoid valve |85 has a longitudinally movable core 2|!! mounted therein which lis provided with passageways 2|5, 2|@ and 2H. The core 2M is normally urged towards the right in Figure 12 by a compression spring 22|) and maybe moved towards the left in Figure 12 by means of a solenoid coil 22| which surrounds a solenoid core or extension 222 extending from the right-hand end of the core 2 4. The solenoid coil r 22| :has

wires

223 and 224 connected to opposite sides thereof, the other ends of which are connectedto a magnetic relay 225 which is conventional and a detailed description and illustration of which is thus deemed unnecessary.

A magnetic starter of the type manufactured by General Electric Company, Schenectady, New York and such as is illustrated in Sweets File for Product Designers, section a/8, page 34, may serve Vin the capacity of the magnetic relay 225. Since the magnetic relay 225 is usual construction, no attempt will be made herein to describe the manner in which the various wires or conductors are Yconnected to the same, the magnetic relay merely being shown schematically in Figure 12;

The magnetic relay 225 has lead wires 225 and 227 extending therefrom to opposite sides of a plug 230 adapted to be connected to a suitable source of electrical energy, not shown. The magnetic relay also has wires 23| to 231i, inclusive, extending therefrom. The wires 23| and 232 are connected to opposite sides of a momentary-contact stop switch 235 'and the

wires

233 and 235 are lconnected to Yopposite sides of a momentarycontact start switch 235. The switches 235 and 255 are of the push-button type and are suitably secured to corresponding brackets 23? (Figures l, 2 and 5) suitably secured to and depending from., the lower surface of the support plate |35.

Switch actuating elements in the form of pins Eand 25| are disposed in alinement with, and are adapted to alternately engage, the push-buttons of the respective stop and start

switches

235 and 236. The switch actuating element 240 is fixed to a substantially Z-shaped bracket 252 which is. suitably secured to the block ISI to which the free end of the piston rod |51! is connected. The switch actuating element 25| is fixed to one end of an arm or bracket 245 which extends inwardly and upwardly above the cylinder |52 (Figures 1, 2 and l2) and is suitably secured to the rack |55.

Method of operation Obviously, the first step in operation of this apparatus is to form the surface 5Eand the grooves |25 and |2| in the lower surface of the workpiece 55 in substantially the shape of the articles A t0 be cut from the workpiece W. In order to determine the exact shape of the irregular groove I5! in the cam plate or pattern form |55, a lead pencil may be substituted for the roller ll or the roller and the stub shaft lll carried by the lever arm or stylus |115, the lead pencil being so positioned that it engages the upper surface of the pattern form or cam .plate |56. ,The operator then positions the workpiece support 55 upon the table, aligning one or the other of the open ends of the groove |2| with the sprocket wheel |25 and then slides the workpiece support 55 along the table S5 so the vertical walls of the groove |2| straddle the sprocket wheel |25 and so that the vertical walls of the groove |25 straddle the roller or follower |23.

The operator then moves the workpiece suppo'rt or platform 55 along the upper surface of the table 35 and the conventional table |2 with the surface 55 adjacent the cutter blade il' and with the rollers 1or followers |23 and |52 disposed in the respective grooves |25 and |22 formed in the bottom of the workpiece support or platform 55. Thus, as the operator moves the workpiece support 55 from left to right across the auxiliary table 35 and oscillates the same about the roller or follower |23 so that the cutting edge of the cutter blade Il is tangent to the surface 55 at all times, this causes the lever arm or stylus W5 to oscillate vabout its pivot point |55 to, in turn, cause the pencil or other marking device supplemented for the roller |8| to form a curved or irregular line on the upper surface of the pattern form or cam plate |46.

The pattern form or cam plate |56 is then removed from the machine and the line formed thereon in the manner heretofore described is used as a guidevin cutting the cam groove or patternY groove 15| in the pattern form or cam plate |45. The roller or follower |8| is then reinstalled on the lever H5 and the pattern form or cam plate |45 is then re-installed in the ma chine with the left-hand end thereof in Figure secured to the bracket |52. Thereafter, a workpiece W is placed upon the Ytable and fastened to the plate 5l of the workpiece feeding mechanism 5|, whereupon the plunger or rack 62 is manually positioned so that the rear'edge of the workpiece W extends beyond the surface 55 of the workpiece support 55 the desired distance to `subsequently cut an article A of the desired thickness from the workpiece W.

In order to enable the operator to move the rack 62 freely in either direction, the pin 81 may be moved out of engagement with the rack 86 and the rack 56 may be swung upwardly out of engagement with the corresponding pinion or gear 91| so that the shaft 95 and the

gears

93 and 65 may rotate freely without moving the piston rod and intervening connections.

Also, in order to enable the operator to move the rack 62 freely in the tubular guide member 63, the operator may loosen the screw ||3a to thus relieve the pressure of the friction element ||3 against the rack 62. Of course, the rack 85 is again lowered and the pin 81 re-installed after the workpiece has been properly positioned l the operator 36 and, also, the operator may again tighten the lock screw ||3a to again cause the friction element ||3 to frictionally engage the rack or plunger 62.

The apparatus is then ready for automatic op eration to successively sever articles A of identical configuration and thickness from the workpiece W. Since the cylinder 16 is fixed to move with the platform or workpiece support 55, it is preferable that the

conduits

13 and 15 extending therefrom be exible. However, the remaining pipes or conduits illustrated in Figure 12 may be of rigid construction, if desired,

In operation it is to be assumed that the workpiece support 55 is positioned so that the workpiece W is disposed to the left of or adjacent the cutting edge of the cutter blade |1 or, in other words, somewhat to the left of that shown in Figure 3 relative to the cutter blade |1, The switch actuating element 240 would then be in engagement with the plunger or push button of the stop switch 255, thereby causing de-energization of the solenoid coil 22| in the solenoid valve |86 (Figure 12). This causes the core 2 I4 to assume the position shown in Figure l2.

The operator then rotates the core |96 of the manually operable regulator valve |95 a desired amount in a counterclockwise direction in Figure 12 to establish communication between the pipes 265 and |56. This permits fluid to flow under pressure from the reservoir 263 through the pump through pipe 200, through pipe |63 and through the branch pipe 16|, to the solenoid valve |86. Since the passageway 2 I6 is then positioned in alinement with branch pipe ISI and pipe |12, fluid under pressure would continue through passageway 2|6, through the pipe |12 and through the pipe 14 to the cylinder 16, since the reducing valve |81 will retard the flow of the fluid under pressure and will cause the fluid under pressure to enter the pipe 14 before it continues through the pipe |12 to the cylinder base |56.

Thus, upon fluid entering the front end of the cylinder 16, the piston 16 and piston rod 15 move rearwardly or from left to right in Figure 6 to thereby impart movement to the tubular guide member 63 and to cause rack 62 to advance twice as far as said rack 62, in the manner heretofore described, for feeding the workpiece W past the surface 56 of the workpiece support 55 a predetermined distance. As the piston 16 approaches the end of its active stroke, as limited by the washer 16 in Figure 6, the pressure builds up back of the reducing valve |81 and then passes through the valve |81 and into the right-hand end of the cylinder |52. This causes the piston |51 and piston rod |66 to move from right to left in Figures 2 and 12, to, in turn, move the rack |65 and the 14 pattern form or cam plate |46 from right to left in Figures 2, 3, 4 and 12.

However, due to the gears |66, |16 and |31, the sprocket wheel |25 rotates in engagement with the sprocket chain |24 thereby causing the workpiece support 55 to move from left to right in Figures 2, 3 and 4, or in the opposite direction from that in which the rack |65 and the pattern form |116 are moved. As the workpiece support 55 moves from left to right, it is evident that the lever arm or stylus |15 will oscillate about its pivot point |16 due to the groove |5| in the pattern form or cam plate |46 moving past the follower or roller i6 I. Thus, the cutter blade |1 will sever an article A from the workpiece V7' conforming substantially to the shape of the irregular groove |26 in the bottom of the workpiece support 55 as the workpiece support 55 is pivoted about the roller or follower |23 by the follower |82 riding in the groove |22.

It is evident that, during the active stroke of the workpiece support 55, the uid returns from the left-hand end of the cylinder |52 through the pipe |13, passageway 2|1 in the core 2M of the solenoid valve |86, pipe 2|2 and pipe 2li) to the reservoir 263. Upon the workpiece support 55 reaching the end of its active stroke, the switch actuating element 25| engages the start switch 236 which, in turn, energizes the solenoid coil 22| and causes the core 2M in the solenoid valve |86 (Figure 12) to move from right to left until the passageway 2 6 is alined with the branch pipe |92 and the pipe |13.

Now, when the passageway 2|6 is alned with the pipe |92, fluid under pressure flows from the branch pipe |92 through the passageway 2 I6 and the pipe |13 to the pipe 13, since the reducing valve |88 will momentarily retard the filow or" .fluid under pressure to the left-hand end of the cylinder |52. This causes the fluid under pressure to enter the right-hand end of the cylinder 16 in Figures 6 and 12 whereupon the piston 15 will move from right to left until the washer 151 engages the right-hand end of the cylinder head 1|. Of course, this returns the slide 6d, the tubular guide member 63, the shaft 65 and the

gears

93 and 94 to their original position during which the plunger or rack 62 returns with, and the same distance as, the tubular guide member, due to the overriding clutch mechanism |62, as has heretofore been described.

When the pressure of the iiuid in the pipe |13 has built up sufciently, the reducing valve 65 permits fluid to continue through the pipe |13 to the left-hand end of the cylinder |52 in Figures 2 and 12. Thus, the piston rod |66 and associated parts will move from left to right in Figures 2 and l2 to move the rack |65 and the pattern form or cam plate |46 in the same direction. Of course, the gears |66 and |16 will then rotate in the opposite direction from that in which they rotated during the active stroke of the platform or workpiece support 55, thereby causing the workpiece support 55 to move from right to left or in an inactive stroke to return to its original position.

The workpiece W will then again be :advanced a predetermined distance in the manner heretofore described to thereby complete a cycle in the operation of the machine.

It is thus seen that I have provided an irnproved pattern controlled mechanism for use in association with a cutting machine of the bandsaw type which is so designed that a plurality of successive articles of identical configuration may be cut from a single workpiece without the necessity of performing any manual operations other than setting up the machine and securing a workpiece to the workpiece feeding mechanism El. It is evident that such an apparatus greatly increases the productive capacity of a particular machine during a given period and, since no manual operations are necessary in guiding the workpiece past the cutter blade l1, it is evident that all of the articles cut from the workpieces will be of more uniform shape and thickness than has heretofore been possible on machines of this type heretofore in use.

It might be stated that the present apparatus operates most efficiently when liquid pressure is used as the propelling medium, however, it is to be understood that air pressure may also be used or, the racks 52 and IE5 may be reciprocated by other means, such as reversible electric motors coupled thereto, if desired.

In the drawings and specification there vhas been set forth a preferred embodiment of the invention and, although specic terms are employed, they are used in a generic and descriptive sense only and not for purposes of limitation, the scope of the invention Vbeing defined in the claims.

claim:

1. In a bandsaw machine provided with a con tinuously moving vertically disposedlcutter blade having a cutting edge and a table through which the cutter blade passes; the combination of a workpiece support movable on said table, means to secure a workpiece on said workpiece support, said workpiece support having an irregular `groove in the lower surface thereof adjacent that edge of the workpiece support disposed adjacent the cutter blade, a first guide element carried by said table and extending into said irregular groove in the workpiece support, said rst guide element being disposed adjacent the cutter blade, a pattern form mounted for horizontal movement beneath said table, said workpiece support also having an elongated groove in the lower surface thereof extending in a straight line substantially parallel to the general path of travel of the workpiece support during the cutting of a piece from the workpiece carried thereby, a pivoted lever carried by said table, said pattern form having an irregular pattern groove in the upper surface thereof, second and third guide elements on opposite ends of said lever arm, the second guide element engaging the elongated groove in the lower surface of the workpiece support and the third guide element engaging the pattern groove in the pattern form, and means to move the pattern form'in one direction while simultaneously moving the workpiece support in the opposite direction in an active stroke -of the workpiece support whereby said lever arm will cause the workpiece support to move in an irregular path past the cutter blade for cutting an irregularly shaped piece of predetermined configuration from the workpiece.

2. In a bandsaw machine provided with a Vcon-- tinousiy moving vertically disposed cutter blade having a cutting edge and a table through which the cutter blade passes; the combination of a workpiece support movable on said table, means to secure a workpiece on said workpiece support, said workpiece support having an irregular groove in the lower surface thereof adjacent that edge of the workpiece support disposed adjacent the cutter blade, a first guide element carried by said table and extending into said irregular'gro'ove in the workpiece support, said :first guide 'ele- Y ment .being disposed adjacent the cutter blade,

a pattern form mounted for horizontal movement beneath said table, said workpiece support also having an elongated groove in the lower surface thereof extending in a straight line substantially parallel to the general path of travel of the workpiece support during the cutting of a piece from the workpiece carried thereby, a pivoted lever carried by said table, said pattern form having an irregular pattern groove in the upper surface thereof, second and third guide elements on opposite ends of said lever arm, the second guide element engaging the elongated groove in the lower surface of the workpiece supa port and the third guide element engaging the pattern groove in the pattern form, means to move the pattern form in one direction while simultaneously moving the workpiece support in the opposite direction in an active -stroke of the workpiece support whereby said lever arm will cause the workpiece support to move in an irregular path past the cutter blade for cutting an irregularly shaped piece of predetermined configuration from the workpiece, and means operable automatically upon the termination of each active stroke of the workpiece support for returning the workpiece support in an inactive stroke.

3. In a bandsaw machine provided with a continuously moving vertically disposed flat sided cutter blade having a cutting edge anda table through which the cutter blade extends or passes; the combination of a workpiece support movable on said table, a workpiece feeding mechanism carried by said workpiece support, means to secure a workpiece to the workpiece feeding mechanisrn, said workpiece support having .an irregular groove in the lower surface thereof adjacent that edge of the workpiece support disposed adjacent the cutter blade, a vfirst kguide element carried by said table and extending into said irregular groove in the workpiece support, said first guide element being disposed adjacent one of the at sides of said cutter blade, a pattern form mounted for horizontal movement beneath said table, said workpiece support also having a straight groove in the lower surface thereof extending substantially parallel to the general path of travel of the workpiece support during the cutting of a piece from the workpiece carried thereby, a pivoted lever carried by .said table, said pattern form having an irregular .pattern groove in the upper surface thereof, second and third guide elements on opposite ends of said lever arm, the second guide element engaging the straight groove in the lower surface of the workpiece support and the third guide element engaging the pattern groove in the pattern form, means to move the pattern form in one direction while simultaneously moving the workpiece support in the opposite direction in an active stroke of the workpiece support whereby said lever arm will cause the workpiece support to move in an irregular path past the cutting Vblade for cutting an irregularly shaped piece of predetermined configuration from the workpiece, means operable automatically upon the termination of each active stroke of the workpiece support for returning th'e workpiece support in an inactive stroke, and means operable automatically upon the termination'ofyeach inactive stroke of the workpiece support for operating the workpiece feeding mechanism `to feed the workpiece a predetermined distance relative to the workpiece support.

4. In a bandsaw machine having a vertically disposed constantly moving flat sided cutter blade and a horizontal table through which the cutter blade passes; the combination of a platform slidable upon said table, guide means beneath said table, a pattern plate movable in said guide means beneath said table parallel to the nat sides of said cutter blade, a cylinder fixed beneath said table in substantially parallel relation to said pattern plate and to opposite ends of which a source of fluid under pressure is adapted to be connected, a piston rod mounted for longitudinal movement of said cylinder, a rack xed to the free end of said piston rod, the lower` surface of said platform being provided with a pair of substantially parallel irregular grooves therein conforming substantially to the shape of a piece to be out from a workpiece adapted to be positioned upon said platform, a follower carried by said table and working in the rst of said grooves in the lower surface of said platform and being disposed immediately adjacent one side of said cutter blade, the second of said grooves having projections on one side wall thereof, a sprocket wheel disposed in said second of said grooves and meshing with said projections in said second of said grooves, means connecting one end of said pattern plate to said piston rod, a shaft on which said sprocket wheel is flxedly mounted a pinion xed on said shaft and meshing'with said rack, means for alternately directing uid under pressure to opposite ends of said cylinder whereby, upon movement of said piston rod in one direction, the rack will cause movement to be imparted to the platform through the medium of the sprocket Wheel, and the piston rod will simultaneously cause the pattern plate to move relative to said table, said pattern plate having an irregular pattern groove in the upper surface thereof, a stylus pivotally connected intermediate its ends to the lower surface of said table, follower means on opposite ends of said stylus, an elongated groove in the lower surface of said platform, one of said follower means on the stylus engaging said elongated groove and the other of said follower mea-ns on the stylus engaging the irregular groove in the pattern plate whereby, upon reciprocatory movement of the piston rod, the pattern form and the platform will move relative to the Saw and the stylus will cause the platform to move in an irregular path for automatically severing a piece of predetermined irregular configuration from the workpiece.

5. In a structure according to claim 4, workpiece feeding means carried by the platform and to which the workpiece is adapted to be connected, and means operable automatically upon each inactive stroke of the platform for eifecting operation of the feeding means to feed the workpiece a predetermined distance relative to the platform to subsequently sever a piece from the workpiece of predetermined thickness.

References Cited in the le of this patent UNITED STATES PATENTS Number Name Date 711,533 Roper Oct 21, 1902 1,793,461 Biro Feb. 24, 1931 2,102,865 Vickers Dec. 21, 1937 2,530,880 Hermann Nov. 21, 1950 2,548,598 Benge Apr. 10, 1951 2,625,955 Crane Jan. 20, 1953